Mold for artificial stone.



ITEI) STATES PATENT OFFICE. JAMES M. HUTOHINsON, OE NEW YORK, N. Y.,ssIGNOR TO D, HOWARD HAYWOOD, TRUSTEE, OE NEW YORK, N. Y.

Specification of Letters Patent.

Patented Nov. 28, 1905 Application filed April 8, 1905. Serial No.254.460. I

To all whom t may concern:

Be it known that I, J AMEs M. HUToHiNsoN, a citizen of the United Statesof America, and aresident of the city, county, and State of New York,have invented certain new and useful Improvements in Molds forArtificial Stone, of which the following is a specification, referencebeing had to the accompanying drawings, forming a part thereof.

My invention relates to improvements in molds for the casting ofartificial stone; and it consists in a mold composed of aplasticmaterial substantially impervious to water and provided atsuitable points with drainagepipes. i

The main object of my invention is to secure a better surface for` thatportion of the artificial stone which is ultimately presented toview-and to secure a stone having substantially uniform qualitiesthroughout.

Artificial stone as commonly cast at the present day is either cast in amold of absorbent material, such as sand, in which case moisture fromthe stone is absorbed through the sand, or in a mold of substantiallynonporous material, such as cement or the like, in which there is nodrainage f or the free water, the same being carried off by evaporationonly. To the former formof mold there are two objections. First, thegranular material employed does not give as true a surface or finish tothe stone as is desired, and, second, the drainage through the bottom ofthe mold causes an inequality throughout the stone when finished, whilestone produced in the latter form of mold is not of as good a quality asis desired, and such a mold is very expensive to make. Again, the moldformed of granular material is very easily injured or destroyed inhandling, any fine or intricate pattern rendering the mold extremelydelicate. While this fragibility is obviated in the second form of mold,the expense thereof renders it impracticable for commercial purposes. Inmy present inventionI have overcome the defects of both forms of moldreferred to,in that the mold is simple and inexpensive to make andproduces a stone fulfillward andpinsert drainage-tubes connecting withthe ends thereof. The drainage-tubes may conveniently be pipes or tubescovered, if desired, with a mesh in order to protect the ends thereofand, further, if desired, filled with a cellular, tubular, fibrous, orgranular material.

In order that my invention may be fully understoooh'I will now proceedto describe an embodiment thereof and will then point out the novelfeatures in claims.

In the drawings, Figure 1 is a -view in central vertical longitudinalsection through a mold embodying my invention. Fig. 2 is a Vview incentral vertical transverse section therethrough. Fig. 3 is a view inperspective of an artificial stone cast in the mold illustrated in theprevious figures. n

A lump of plastic material, such as clay, is placed upon a surface 1,the clay being designatedl by the reference character 2. A pattern ofthe suitable size and shape is then pressed into the clay or the clayotherwise formed around same, the pattern being arranged with its face,corresponding to that face of the finished artificial stone which is tobe exposed, downward. Drainage-tubes 3 are inserted, their Sends openinginto the cavity formed by the pattern, a piece of fabric or other mesh 3being provided at the end of the said drainage-tubes, if desired, asshown. The pattern is now removed and the mold is then ready to receivethe material of which the artificial ,stone is to be made'. A clay moldthus'formed is very strong, and, should it be accidentally injured, mayeasily be repaired. To repair a sand mold of any intricacy is next toimpossible, as is well understood. The stone material in a suitableplastic condition is inserted in the cavity in IOO drainage-tubes 3 willcarry away this excess lary attraction only. The result is a great euniformity throughout the finished stone. Further, the face of thefinished stone will be smooth and of an approved inish, owing' to thesmoothness of the clay, any marks or blemishes, such as at 4, Fig. 3,caused by the drainage being at the end of the stone, where they willnot be seen when the stone is in place. y

Any suitable plastic material substantially impervious to Water may beemployed for the mold Within the scope of my invention; but so far Ihave found clays to be the most satisfactory, the preferred materialbeing kaolin.

The drainage-tubes may be filled up with absorbent material, such asmineral Wool, granular material, or any desired substance such as willact to carry away moisture by capillary attraction, such substance beingindicated at 5 in the drawings.

1. A mold for articial stone, composed of plastic material,substantially impervious to Water, and provided with means for drainingthe mold-cavity.

2. A moldfor artificial stone, composed of plastic material,substantially impervious to Water, and provided With means for drainingthe mold -cavity through the end walls thereof.

3. A mold for artificial stone, composed of plastic material,substantially impervious to Water, and provided with laterally-arrangeddrainage-tubes communicating with the moldcavity through the end wallsthereof.

4. A mold for artificial stone, composed of plastic material,substantially impervious to Water, and provided with laterally-arrangeddrainage-tubes communicating with themoldcavity through the end Wallsthereof, said tubes provided with a mesh at their inner ends.

5. A mold for artificial stone, composed of clay, and provided Withdrainage means connecting with the mold-cavity at points above thebottom thereof.

6. A mold for artificial stone, composed of kaolin, and provided withdrainage means connecting with the mold-cavity at points above thebottom thereof.

JAMES M. HUTCHINSON.

Vtitnesses:

D. HOWARD HAYWooD, C. F. UARRINGTON.

